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debian/amd64 port
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(short status update)

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Bart Trojanowski
bart@jukie.net


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Overview

	Background
	The plan
	Donated hardware
	Tool chain
	Problems
	Current status
	Resources


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Background: the platform

	Platform name
		x86_64 vs x86-64
		amd64

	Libraries
		/lib & /lib64

	linux32
		32bit personality


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Background: the platform

	Advantages
		64bit math
		address space
		16 general purpose registers

	Disadvantages
		larger executable size
		stack/pointer bloat
		need to have 32bit and 64bit libs


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Background: prior work

	Tool chain
		binutils
		gcc3
		glibc

	Kernel 
		2.4 & 2.5 (Andi Kleen)

	s390x / sparc64
		similar architecture split
		debian patches (Gerhard Tonn)
		amd64 work (Arnd Bergmann)


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The plan:

	The proposal
		biarch toolchain
		64bit kernel
		package core libraries
		autobuilder dependencies
		autobuilder magic

	Future work
		dpkg and amd64 architecture
		2.5 kernel
		install CD


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Hardware:

	AMD Developer Center
		sign up at AMD Dev Center
		contact Kurt Keville
		5 developers (soft max)

	ravel.hpc2n.umu.se 
		contact Mattias Wadenstein
		donated by AMD/Sweden

	other donations
		lack of developers


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Tool chain:

	x86-64.org

	Arnd Bergmann's biarch packages
		binutils
		gcc
		glibc
		kernel

	64bit builds
		CC='gcc-3.3 -m64'


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Problems:

	dpkg
		Architecture: amd64 vs Depends: {64}

	apt
		sub architectures

	lack of developers

	glibc split


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Problems: dpkg

Solution 1
	Architecture: amd64
		intuative
		very complex change
		dpkg-*
		debhelper
		breaks some debian/rules

	The easier solution :)

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Problems: dpkg

Solution 2
	Depends: {64}
		package names
			i368 != amd64
		relatively simple
			dpkg
			dpkg-deb
			dpkg-shlibdeps

	The better solution


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Problems: apt

	Needs to know and understand 
		lib64 packages
		Depends: {64}


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Problems: glibc

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	libc6
	lib64c6
	libc6-utils
	libc6-data
	libc6-headers
	libc6-dev
	lib64c6-dev
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                               32bit runtime libs
                               64bit runtime libs
                               32bit|64bit binary tools
                               data files
                               headers
                               32bit development libs
                               64bit development libs


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Status:

	Usage
		install Sarge
		install biarch toolchain
		install 64bit kernel

	Limitations
		build 32bit or 64bit apps on debian
		run i386 debian tools
		dpkg/apt not ready for amd64
			use --force-architecture


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Resources:

	architecture
		http://www.x864-64.org
		http://www.developwithamd.com/

	debian/amd64
		http://lists.debian.org/debian-x86-64/
		#debian-amd64 (irc.debian.org)

	developer resources
		http://www.arndb.de/debian/
		http://www.jukie.net/~bart/debian/amd64/
		http://people.debian.org/~gt/lib64/